Description
OTIS SPBC III Board GCA26800KX1 Brief Introduction
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OTIS SPBC III panel GCA26800KX1
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Product Name
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Elevator PCB Board
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Model
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GCA26800KX1
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Quality
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Original.Brand New
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Payment
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T/T. Paypal. Western Union
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Delivery
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3-5 Working Days
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Packaging
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Packed by carton
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Elevator SPBC III Board GCA26800KX1 – The 3rd-Generation Car-Top Brain That Never Forgets a Floor
Courtesy of Nanjing Zhuye Elevator Parts Co., Ltd.
Courtesy of Nanjing Zhuye Elevator Parts Co., Ltd.
Every time you press a car button, watch the position indicator scroll, or hear the doors announce “going up,” you are really talking to a credit-card-sized green PCB hidden inside the car-top box — the SPBC III (Serial Position & Button Controller). Otis part number GCA26800KX1 is the latest third-generation board, field-proven on Gen2-R2®, Gen2-Life® and SkyRise® installations worldwide. Nanjing Zhuye Elevator Parts keeps factory-sealed KX1 units in anti-static stock for same-day despatch. Below we explain what the board does, how to install it in under eight minutes, and the replacement cycle that prevents expensive “car-top com lost” call-backs.
1. What GCA26800KX1 Really Does
Mounted on DIN-rail inside the COP top box, the board:
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Reads 64 car-button presses through a 64-way ribbon cable every 25 ms
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Drives 7-segment or dot-matrix floor indicators via 12 VDC serial bus
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Sends door-open, door-close and inspection signals to the LMCB through CAN-bus at 125 kbit s⁻¹
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Supplies 5 VDC / 12 VDC rails for COP accessories, gongs and hall lanterns
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Stores floor parameters, learn tables and fault log in 1 Mb FRAM — retains data for 20 years without battery
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Monitors emergency battery voltage and triggers alarm buzzer if <21 V
If KX1 fails, the cab goes dark, the doors refuse to move, and the controller logs “EF5 Car-Top Com Lost”.
2. Compatible Systems
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Otis Gen2-R2®, Gen2-Life® 1.0–2.5 m s⁻¹
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SkyRise® MRL up to 45 floors
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Thyssen MC2 → MC3 retrofit kits
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Chinese OEM controllers with CAN-open protocol
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Simplex or group (≤8 cars)
3. Installation – 8-Minute Hot Swap
Safety: place controller on INSTALL, lock main breaker, wait 60 s for DC bus to discharge.
Step 1 – Open car top box; photograph existing wiring.
Step 2 – Undo four M3 screws holding the plastic carrier; slide KX1 out of DIN rail guides.
Step 3 – Disconnect (in order) 64-way ribbon, 6-way CAN, 4-way 12 VDC supply and 2-way buzzer.
Step 4 – Inspect ribbon for cracked insulation; if any conductor shows copper, replace ribbon (Nanjing Zhuye part WR-64-300).
Step 5 – Insert new KX1 until latches click; reconnect all plugs — keyed to prevent mis-mating.
Step 6 – Power up; green D1 LED blinks 2 Hz for 3 s, then solid — board has joined CAN network.
Step 7 – Run one full learn trip; verify position indicator counts every floor.
Step 2 – Undo four M3 screws holding the plastic carrier; slide KX1 out of DIN rail guides.
Step 3 – Disconnect (in order) 64-way ribbon, 6-way CAN, 4-way 12 VDC supply and 2-way buzzer.
Step 4 – Inspect ribbon for cracked insulation; if any conductor shows copper, replace ribbon (Nanjing Zhuye part WR-64-300).
Step 5 – Insert new KX1 until latches click; reconnect all plugs — keyed to prevent mis-mating.
Step 6 – Power up; green D1 LED blinks 2 Hz for 3 s, then solid — board has joined CAN network.
Step 7 – Run one full learn trip; verify position indicator counts every floor.
No laptop or download is required; firmware is pre-flashed to match Otis checksum 0x7A3C.
4. Daily Operation – What the Board Actually Does
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Updates floor display every 50 ms; no ghosting or skipping
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Auto-dims LEDs to 30 % after 22:00 (energy code compliant)
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Built-in clock chip for fault time-stamping (±1 minute per year)
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Temperature sensor on PCB derates CAN speed above 70 °C — no summer nuisance faults
5. Replacement Cycle & Preventive Maintenance
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High-traffic office (>1,000 starts day⁻¹) – vacuum dust every 6 months, replace board every 6 years
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Residential tower (300–600 starts day⁻¹) – inspect annually, replace every 10 years
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Low-rise freight (≤200 starts day⁻¹) – inspect every 18 months, replace every 12 years
Replace immediately if:
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D1 LED stays red for >5 s (internal 5 V rail fault)
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CAN “EF5” logged ≥3 times in 30 days
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Position indicator skips floors or shows “––”
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Ribbon connector burnt (usually shorted LED segment)
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FRAM checksum error 0xF0 after power dip (data corrupt)
6. Extending Life – 3 Pro Tips
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Keep 12 VDC supply ±5 %; spikes above 16 V kill the on-board buck converter
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Close car top box properly; condensate from AC blower is the #1 killer of edge connectors
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Tie ribbon cable away from traction sheave; oil + dust creates a conductive film that shorts LED lines
7. Why Buy GCA26800KX1 from Nanjing Zhuye Elevator Parts?
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Factory-new, not refurbished; board passes ICT, 4-hour burn-in at 60 °C, and final functional test
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Firmware pre-flashed; matches Otis original checksum, no teach-in required
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Anti-static aluminum bag + foam box — safe for air freight
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Dual stock: 420 pcs Nanjing, 150 pcs Dubai — next-day delivery to 65 countries
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Warranty: 24 months replacement, no factory RMA wait
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Tech support: 7×24 WhatsApp/WeChat video call if fault codes persist
Conclusion
The GCA26800KX1 SPBC III board is the invisible brain that turns button presses into smooth rides. A single communication fault can park a car for hours. Keep a spare KX1 from Nanjing Zhuye on every service truck, swap it on schedule, and replace “car-top com lost” panic with a five-minute planned fix — one crystal-clear floor at a time.
